Functions to estimate the density and size of a spatially 
  distributed animal population sampled with an array of passive detectors, 
  such as traps, or by searching polygons or transects. Models incorporating 
  distance-dependent detection are fitted by maximizing the likelihood. 
  Tools are included for data manipulation and model selection.

Tools for designing spatially explicit capture-recapture studies of animal populations. This is primarily a simulation manager for package 'secr'. Extensions in version 2.5.0 include costing and evaluation of detector spacing.

Allow sharing sensitive information, for example passwords,
    'API' keys, etc., in R packages, using public key cryptography.

Fast and memory-efficient streaming hash functions,
    binary/text encoding and serialization. Hashes strings and raw vectors
    directly.  Stream hashes files which can be larger than memory, as
    well as in-memory objects through R's serialization mechanism.
    Implements the SHA-256, SHA-3 and 'Keccak' cryptographic hash
    functions, SHAKE256 extendable-output function (XOF), 'SipHash'
    pseudo-random function, base64 and base58 encoding, 'CBOR' and 'JSON'
    serialization.

Facilitates secret management by storing credentials in a dedicated file, 
          keeping them out of your code base. 
          The secrets are stored without encryption.  
          This package is compatible with secrets stored by the 'SecretsProvider' 'Python' package <https://pypi.org/project/SecretsProvider/>.

Encrypt text using a simple shifting substitution cipher with setcode(), providing two numeric keys used to define the encryption algorithm. The resulting text can be decoded using decode() function and the two numeric keys specified during encryption.

Functions are provided for internal use by the spatial 
  capture-recapture package 'secr' (from version 5.4.0). The idea is to speed up 
  the installation of 'secr', and possibly reduce its size. Initially the functions 
  are those for area and transect search that use numerical integration code from 
  'RcppNumerical' and 'RcppEigen'. The functions are not intended to be user-friendly 
  and require considerable preprocessing of data.