Generating a private key from a random number Creating a bitcoin key is essentially the same as “Pick a number between 1 and 2256.” The exact method you use to pick that number does not matter as long as it is not predictable or repeatable. More precisely, the private key can be any number between …
EPSILON The Number.EPSILON property represents the difference between 1 and the smallest floating point number greater than 1 > Number.EPSILON == Math.pow(2, -52) true Use Number.EPSILON to test floating point number equality. x = 0.2; y = 0.3; z = 0.1; equal = (Math.abs(x – y + z) < Number.EPSILON); https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/EPSILON MAX_SAFE_INTEGER & MIN_SAFE_INTEGER The MAX_SAFE_INTEGER constant has a …
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See: List of non-cryptographic hash functions Pearson hashing Pearson hashing is a hash function designed for fast execution on processors with 8-bit registers. This hash function is a CBC-MAC that uses an 8-bit substitution cipher implemented via the substitution table. An 8-bit cipher has negligible cryptographic security, so the Pearson hash function is not cryptographically strong, but it is useful for implementing hash tables or as a data integrity check …
$ cat pearson_hashing.py from random import shuffle example_table = list(range(0, 256)) shuffle(example_table) def hash8(message, table): hash = len(message) % 256 for c in message: #hash = table[(hash+ord(c)) % 256] print(f’for c=\'{c}\’, ord(c)={ord(c)}: {hash} ^ {ord(c)} => {hash ^ ord(c)} and table[hash ^ ord(c)] = {table[hash ^ ord(c)]}’) hash = table[hash ^ ord(c)] return hash if …
Taken from: https://www.docusign.com/how-it-works/electronic-signature/digital-signature/digital-signature-faq
Probabilistic (P11C) data structure https://github.com/guyroyse/understanding-probabilistic-data-structures/blob/master/code/bloom-filter/javascript/bloom.js https://github.com/guyroyse/understanding-probabilistic-data-structures/blob/master/slides/understanding-probabilistic-data-structures.pdf
Documentation https://docs.aws.amazon.com/cdk/latest/guide/stack_how_to_create_multiple_stacks.html https://docs.aws.amazon.com/cdk/latest/guide/get_context_var.html https://docs.aws.amazon.com/cdk/latest/guide/testing.html CDK Constructs Library TypeScript API Reference Best Practices github.com/kevinslin/open-cdk Examples github.com/kolomied/awesome-cdk github.com/cloudcomponents/cdk-constructs/tree/master/examples github.com/aws-samples/aws-cdk-examples github.com/blndspt/aws-full-stack-template github.com/awslabs/aws-full-stack-template github.com/aws-samples/aws-bookstore-demo-app bobbyhadz.com/blog/how-does-aws-cdk-work bobbyhadz.com/blog/cdk-constructs-tutorial bobbyhadz.com/blog/aws-cdk-identifiers bobbyhadz.com/blog/how-to-use-context-aws-cdk bobbyhadz.com/blog/aws-cdk-parameters-example bobbyhadz.com/blog/aws-cdk-vpc-example bobbyhadz.com/blog/aws-cdk-security-group-example Some Gotchas When synthesizing an AWS CDK stack, I get the message –app is required either in command-line, in cdk.json or in ~/.cdk.json This message usually means that you …
See: Google Cloud SDK (gcloud CLI) Create project in https://console.cloud.google.com Enable Google Drive API in console https://developers.google.com/drive/api/v3/enable-drive-api Using gcloud cli: gcloud doesn’t provide command to access google drive. Install gdrive https://github.com/prasmussen/gdrive After entering verification code from browser: -q, –query <query> https://developers.google.com/drive/api/v3/search-shareddriveshttps://developers.google.com/drive/api/v3/ref-search-terms#operators –order <sortOrder> OrderBy sets the optional parameter “orderBy”: A comma-separated list of sort keys. …
Installation options Home Brew: https://formulae.brew.sh/cask/google-cloud-sdk Official: https://cloud.google.com/sdk/docs/install gcloud CLI gcloud init – initialize or reinitialize gcloud See: https://cloud.google.com/sdk/docs/initializing gcloud auth – manage credentials gcloud auth login – authorize gcloud to access Google Cloud Platform with Google user credentials gcloud auth list – lists credentialed accounts gcloud auth activate-service-account – authorize access to Google Cloud Platform …
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