Arenim Group is a Hungary-based IT and telecommunications software development company operating under the KvantPhone brand. The company specializes in secure communication solutions, with a product portfolio built on a proprietary Voice-over-IP and encryption engine developed since 2006. Its flagship product, KvantPhone, is a post-quantum secure calling and messaging application publicly released in May 2024. KvantPhone incorporates NIST-approved quantum-resistant cryptographic algorithms and has undergone third-party security audits, including an assessment by NCC Group. The product is available worldwide via application store subscriptions and is positioned for organizations and individuals requiring protection against both current and future quantum computing-based threats. The company also offers KvantMail, a secure encrypted email solution first deployed in 2021 for security-sensitive clients. KvantMail extends Arenim's secure communication portfolio beyond voice and messaging into email. Arenim's earlier product, CryptTalk, served as the foundation for KvantPhone and won the ITBN Most Innovative IT Security Product award in 2014. The company rebranded CryptTalk to KvantPhone as part of its transition to post-quantum security standards. Beyond its software products, Arenim provides custom IT security software development, consulting, and system planning services. The company operates a partner program that includes regional resellers and sales agents, targeting security advisory firms, IT security distributors, law firms, and tax advisers as distribution channels. Arenim Group was recognized by the Financial Times as one of Europe's Fastest Growing Companies in 2021 and holds an "AAA – Highest Creditworthiness" rating from Dun & Bradstreet.